Optical Manipulation In Graphene Systems

Based on the Maxwell stress-tensor and the full-wave electromagnetic scattering theory,we focuses on the optical scattering pulling force on graphene coated dielectric particle and core-shell double layers graphene-coated dielectric particle by Bessel beams.Our study have developed more possibilities for optical applications of graphene plasmonics,such as capture,sort and transport of dielectric or palsmonic particles.The main results of our study are listed as follows:1.Optical manipulation on graphene-coated dielectric particleUnder the illumination of a Bessel beam,we investigate the optical scattering force on the graphene-coated dielectric particle.The results show that the optical pulling force is realized near the Fano resonance,which is due to the interference between electric dipole mode and quadrupole one.Moreover,the optical pulling force can be further enhanced and flexibly tuned by controlling the Fermi energy and relaxation time of the graphene.In order to transport the particle over a long distance,the stability for optical trapping on transverse plane is also analyzed.Our results demonstrate that the graphene-coated dielectric particle can be confined at the beam axis with appropriate polarization.2.Optical manipulation on core-shell double layers graphene-coated particleBased on the optical manipulation on graphene-coated particle,we take take one step forward to investigate the optical scattering force on the core-shell double layers graphene-coated particle.Compared with the system of graphene-coated dielectric particle,we realized larger optical pulling force near the Fano resonance by properly adjusting the core-shell volume ratio.When the materials of the core-shell are composed of the high-index particles,it is found that the optical pulling force near the magnetic dipole resonance can be further enlarged with appropriate core-shell volume ratio.The stabilities of the above two different material systems on transverse plane are both demonstrated.Our results provide more possibilities for manipulating particles stably and flexibly,as well as make great significance for revealing the interaction between light and matter.